Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bb125586f28423…

MALICIOUS

PDF

73.5 KB Created: 2021-02-17 01:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 930746727259a7010276f4282336d8e1 SHA-1: a0b481ac5693ece5a81d1492fe5f3d418ff53d36 SHA-256: 55bb125586f28423d0d58b74c6c90ab1a0865b0e596464229704086f4d823a67
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though partially corrupted, contains text related to a 'service manual', which is likely a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/123?utm_term=yfz+450+service+manual PDF link annotation
    • https://cdn.sqhk.co/sawitofi/cU7SdPj/74289828827.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/gfifPjh/air_force_fighter_jets_list.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/jdpTmia/free_movies_hd_2020_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/4ifmuBI/oculus_go_escape_games.pdfIn PDF document text
    • http://lidlid.xyz/o2_answerphone_offsf62y.pdfIn PDF document text
    • https://fipufiradak.weebly.com/uploads/1/3/0/8/130813779/8451959.pdfIn PDF document text
    • https://cdn.sqhk.co/wogirujut/Fjbibii/water_parks_near_me_open_2020.pdfIn PDF document text
    • http://topstudy.fun/zewatiebio.pdfIn PDF document text
    • https://cdn.sqhk.co/tikisudolo/Bchhhia/47910979083.pdfIn PDF document text
    • http://depalowivejal.iblogger.org/types_of_transformer_silica_gel_breather.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/iiPqjgx/nokomaki.pdfIn PDF document text
    • https://zibakuponitek.weebly.com/uploads/1/3/5/3/135303957/todusujomovadagefuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/gjejiJ8/uefa_champions_league_final_2020_time_est.pdfIn PDF document text
    • https://cdn.sqhk.co/fasixazijaz/ijhjfbB/hepatitis_a_vaccine_schedule_before_travel.pdfIn PDF document text
    • http://update-win20.online/vepafapipufukete1n4eq.pdfIn PDF document text
    • https://kowumawadixowiv.weebly.com/uploads/1/3/4/8/134888970/kitonurip-xefajavitum-gonamox.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/favefiz-tupuxaweran-nisota.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/cThIkjc/kpop-_korean_mp3_offline_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lejukujegomi/hdRhegf/word_worm_puzzle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tepuvat.epizy.com/mariage_d_amour_music_sheet.pdfIn PDF document text
    • http://fefemegazo.rf.gd/zalelupavukilutolumabegi.pdfIn PDF document text
    • http://dutuzapeka.rf.gd/93887143124.pdfIn PDF document text
    • http://fiwujugisijema.epizy.com/best_instagram_bio_template.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 5452 bytes
SHA-256: 0405ac2476a5a62a48d08aba47208d2bd18c6f9d0ceef68ba4ed4ec596cb1142
font_01_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 10620 bytes
SHA-256: 96578859847aa0f40cb7d63c41135cca8e5060c3c1ede4fbec972613426a69c9